1. Fuel characteristics of agricultural residues;Kumar;Agricultural Mechanisation in Asia, Africa and Latin America,1984
2. Harvesting and handling agricultural residues for energy;Jenkins;Transactions of ASAE,1985
3. Adams, M. R. and Dougan, J., Waste Products, Coffee, VII — Technology, ed. R. J. Clarke and R. Macrae, Elsevier Applied Science Publishers, London, 1985, pp. 291
4. Tango, J. S., Utilização industrial do café e dos seus subprodutos 28, 49–73, 1971
5. Sivetz, M., Coffee Processing Technology, Vol. 2, AVI Publishing Co., Wesport, 1963